This section is from the book "Commercial Gardening Vol3", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
A small Tineid Moth which lays her eggs in the immature Currant fruitlets, usually two in each. These turn to small larvae which feed in the seed and cause premature ripening of the fruit. When quite small they leave the fruitlets and crawl to some crevice under the rind, etc, near a bud, and there in a flat grey cocoon they remain until next spring, when they emerge and enter the buds and later tunnel up the shoots, which flag and die. The moth appears from the pupa in the dead shoot in May; it is about 1/2 in. in wing expanse, deep brownish with yellow marks on the front wings.
Treatment consists of winter spraying with caustic soda and hand picking the flagging shoots before the moths escape.